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Allt yr Esgair Camp is a prehistoric hillfort situated on Lower Devonian bedrock composed of interbedded sandstone and conglomerate. This geological foundation, laid down during the Early Devonian period, creates a naturally defensible ridge of uneven terrain. The hillfort exploits this underlying stone structure, with its ramparts and ditches cut into and constructed upon the exposed rock outcrops. The site commands significant views across the surrounding Welsh landscape, typical of Iron Age hillforts positioned to control territory and provide early warning of approach.
The monument's construction reflects the defensive priorities of Iron Age communities, who selected locations where natural topography could be reinforced with human-made earthworks. The bedrock geology here would have both aided and constrained construction, offering stable foundations whilst presenting harder stone to excavate for ditch lines.
Allt yr Esgair Camp is protected as a scheduled ancient monument under Cadw reference BR153, ensuring its preservation as an important record of prehistoric settlement and territorial organisation in Wales.
Allt yr Esgair Camp is a scheduled monument protected by Cadw under reference BR153. View the official record →
Allt yr Esgair Camp is a prehistoric hillfort situated on Lower Devonian bedrock composed of interbedded sandstone and conglomerate. It is designated a Scheduled Ancient Monument by Cadw under reference BR153.
Allt yr Esgair Camp dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Allt yr Esgair Camp is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is BR153.
Several scheduled monuments lie within 10 km, including Tor y Foel Deserted Rural Settlement (5.4 km), Carreg Wen Fawr y Rugos cairn cemetery (7 km), Carn Caws, round cairn to N of (7.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Allt yr Esgair Camp's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Allt yr Esgair Camp stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is sandstone and conglomerate, interbedded.